GRB 260903A detected by SVOM with subsequent X-ray and optical counterparts.

AI Summary

The gamma-ray burst GRB 260903A was detected by SVOM/ECLAIRs with a localization accuracy of 10.20 arcmin. Follow-up observations revealed an X-ray counterpart by Einstein Probe (EP-FXT) and fading optical afterglows observed through multiple telescopes.

Measurements

Notices (1)

SVOM — GRB · Thu, 03 Sep 2026 12:36:46 GMT

GCN Circulars (8)

GCN-45510 — GRB 260903A · Fri, 04 Sep 2026 06:11:05 GMT
The Einstein Probe (EP) performed a follow-up observation of the gamma-ray burst GRB 260903A, detecting an uncataloged fading X-ray source within the error region identified by SVOM/VT. The X-ray source, named EPF_J014238.7+112211, has a 0.5-10 keV flux of 9.76e-13 erg/cm^2/s and a localization error radius of 10 arcsec.

GCN-45509 — GRB 260903A · Fri, 04 Sep 2026 01:52:51 GMT
The optical afterglow of GRB 260903A was detected using the T193cm telescope at Observatoire de Haute-Provence, with a preliminary magnitude of r' = 23.0 +/- 0.2 mag (AB). This detection confirms the presence of the optical counterpart reported by other observers.

GCN-45508 — GRB 260903A · Fri, 04 Sep 2026 00:54:37 GMT
The optical afterglow of GRB 260903A was observed using the Nordic Optical Telescope, showing significant fading with a magnitude of 22.88 in the SDSS r band, confirming it as the afterglow of the gamma-ray burst.

GCN-45505 — GRB 260903A · Thu, 03 Sep 2026 20:50:07 GMT
The SVOM mission team reported optical observations of GRB 260903A using the LCO telescope at Siding Spring Observatory, detecting the optical counterpart in three epochs with magnitudes ranging from 20.46 to 21.8 AB. The source showed some fading over time, but no strong evidence of variability was found.

GCN-45504 — GRB 260903A · Thu, 03 Sep 2026 19:00:22 GMT
The SVOM/VT telescope detected an uncatalogued optical source at coordinates R.A. = +01:42:38.96, Dec. = +11:22:13.73, associated with the gamma-ray burst GRB 260903A. The source was observed in both VT_B and VT_R bands with magnitudes of 21.9 +/- 0.2 mag and 20.7 +/- 0.1 mag respectively, approximately 2.1 hours after the initial trigger.

GCN-45503 — GRB 260903A · Thu, 03 Sep 2026 17:20:54 GMT
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GCN-45501 — GRB 260903A · Thu, 03 Sep 2026 15:11:23 GMT
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GCN-45499 — GRB 260903A · Thu, 03 Sep 2026 13:18:42 GMT
The SVOM mission detected a soft, faint gamma-ray burst, GRB 260903A, on September 3, 2026, at 12:37:20 UTC. The burst was localized to RA 1h42m27.28s, Dec 11d23m21.52s with a 90% confidence radius of 10.20 arcmin, but no immediate follow-up observations were performed due to low detection significance.